Tibialis posterior supinates during approximately what portion of the gait cycle?

Tibialis posterior supinates during approximately what portion of the gait cycle?

• A. 0-10%
• B. 35-55%
• C. 70-90%
• D. 90-100%

Answer: (B)

The key idea is how the foot transitions from absorbing impact to becoming a rigid lever for push-off. The tibialis posterior helps this by inverting the foot and supporting the medial arch. After heel contact, it works eccentrically to control pronation, and as stance progresses into midstance, it shifts to contribute to a concentric supination to lock the foot for propulsion. This crucial timing sits in the middle portion of stance, roughly 35-55% of the gait cycle. So, tibialis posterior supinates during that middle window to prepare a stable, efficient push-off.

The key idea is how the foot transitions from absorbing impact to becoming a rigid lever for push-off. The tibialis posterior helps this by inverting the foot and supporting the medial arch. After heel contact, it works eccentrically to control pronation, and as stance progresses into midstance, it shifts to contribute to a concentric supination to lock the foot for propulsion. This crucial timing sits in the middle portion of stance, roughly 35-55% of the gait cycle. So, tibialis posterior supinates during that middle window to prepare a stable, efficient push-off.